Improvement in grinding-mills



2 Sheets-Sheet 2 H. H. WITT & B. L. SMITH.

GRINDING-MILL.

Patented Apri118,1876.

ILPETERS. PHOTO-UTHOGRAPHER. WASHINGTGN. D C.

UNITED STATES HORACE WITT AND BENJAMIN L. SMITH, 0F GADSDEN, ALABAMA.

IMPROVEMENT lN GRINDING-MILLS.

Specification forming part of Letters Patent No 176,393, dated April 18, 1876; application filed March 30, 1876.

To all whom it may concern:

Be it known that we, HoRAoE H. WITT and BENJAMIN L. SMITH, of Gadsden, in the county of Etowah and State of Alabama, have invented certain new and useful Improvements in Grinding-Mills; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of. this specification.

Our invention relates to that class of grinding-mills having a cylindrical burr or runner and a segmental adjustable bed-stone; and the nature of ourinvention consists in the devices for adjusting the bed-stone to the runner, as will be hereinafter more fully set forth.

In the annexed drawings, Figure 1 is a plan view, Fig. 2 is a central vertical section, and Fig. 3 is a detail view, of our invention.

A represents the frame or husk of the mill. B is the cylindrical runner, secured upon a horizontal shaft, having its bearings in boxes on top of the side pieces of the frame. The face or periphery of the runner B is formed with a series of spiral or diagonal curved shoulders,a a, which are formed by cutting down portions of the surface, as is seen in the sectional view. From the top of each shoulder (1 the surface is on a circle, with-the shaft as its center, to a point, b, and from this point the surface is out down to the bottom of the next shoulder.

0 represents the concave or bed stone fixed in a casing, D. This stone is provided with similar shoulders, as described, for the runnerstone; but running in the opposite direction, and near the top of said bed-stone, are two or more horizontalcorrugations, forming ribs d d, as shown.

The bed-stone casing D has two cross-bars, D I), secured to its under side, the ends of which project into inclined guides E E formed in the sides of the frame. In the ends of the cross-bars D are attached rods G G, which extend up through the top side-beams of the frame, and-have thumb-nuts h h screwed upon their upper ends, by which means the bedstone is easily adjusted to the runner, so as to grind finer or coarser, as desired.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

In combination with the bed-stone O and its casing D, the projectingcross-bars D D, inclined guides E E, rods G G, and thumb-nuts It It, substantially as and for the purposes herein set forth.

In testimony that we claim the foregoing as our own we affix our signatures in presence of two witnesses.

HORACE H. WITI. BENJAMIN L. SMITH.

Witnesses as to H. H. WITT:

0. H. WA'rsoN, WILLIAM L. BRAMHALL,

Witnesses as to B. L. SMITH:

THOMAS E. SMITH, JoHN G. LATHAM. 

